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Evtushinsky DV, Inosov DS, Urbanik G, Zabolotnyy VB, Schuster R, Sass P, Hänke T, Hess C, Büchner B, Follath R, Reutler P, Revcolevschi A, Kordyuk AA, Borisenko SV. Bridging charge-orbital ordering and Fermi surface instabilities in half-doped single-layered manganite La(0.5)Sr(1.5)MnO₄. PHYSICAL REVIEW LETTERS 2010; 105:147201. [PMID: 21230862 DOI: 10.1103/physrevlett.105.147201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2008] [Revised: 06/25/2010] [Indexed: 05/30/2023]
Abstract
The single-layered half-doped manganite La(0.5)Sr(1.5)MnO₄ (LSMO), was studied by means of the angle-resolved photoemission spectroscopy (ARPES), scanning tunneling microscopy (STM), and resistivity measurements. STM revealed a smooth reconstruction-free surface; the density of states, extracted from photoemission and tunneling spectroscopy, is in agreement with transport measurements. The derived from ARPES Fermi surface (FS) nesting properties correspond to the known pattern of the charge-orbital ordering (COO), which implies that FS instability is related to the propensity to form a COO state in LSMO.
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Daikeler T, Hoenger G, Oehri I, Tyndall A, Gratwohl A, Brander C, Klimkait T, Gasser O, Hess C. Dominant Epstein-Barr virus-specific T-cell responses are maintained during moderate and intense immunosuppressive treatment. Ann Rheum Dis 2010; 70:395-6. [DOI: 10.1136/ard.2010.129734] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Mehling M, Lindberg R, Raulf F, Kuhle J, Hess C, Kappos L, Brinkmann V. Th17 central memory T cells are reduced by FTY720 in patients with multiple sclerosis. Neurology 2010; 75:403-10. [PMID: 20592255 DOI: 10.1212/wnl.0b013e3181ebdd64] [Citation(s) in RCA: 152] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE FTY720 is a sphingosine 1-phosphate (S1P) receptor modulator that showed efficacy in phase II and III clinical trials in patients with multiple sclerosis (MS). FTY720 inhibits lymphocyte egress from secondary lymphoid organs into the peripheral circulation, thereby reducing the number of circulating naïve and central memory T cells, but not effector memory T cells in blood. Little is known to which of these memory T-cell subsets interleukin 17 (IL-17)-producing T cells (Th17 cells) belong, which are considered to be key mediators of inflammation in MS, and how they are affected by treatment with FTY720. In this study, we determined the phenotype and frequency of Th17 cells in blood of untreated, FTY720-treated, and interferon-beta (IFNbeta)-treated patients with MS and healthy donors. METHODS In a prospective observational study, circulating T cells were phenotypically characterized and Th17 cells enumerated in T-cell subsets ex vivo. Production of IL-17 upon activation and expression of the Th17-specific transcription factor RORC2 was assessed in vitro. RESULTS Th17 cells were found primarily within central memory T cells in all study populations. FTY720 treatment reduced blood central memory T cells, including RORC2+ and IL-17-producing T cells, by >90%. FTY720 did not per se affect IL-17 production when added to activated T cells in vitro. CONCLUSION Phenotypic Th17 cells are defined by a central memory T-cell phenotype. FTY720 reduces these Th17 cells in blood. This is presumably because central memory T cells are retained by FTY720 in secondary lymphoid organs.
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Alekseev MG, Alexakhin VY, Alexandrov Y, Alexeev GD, Amoroso A, Austregesilo A, Badełek B, Balestra F, Ball J, Barth J, Baum G, Bedfer Y, Bernhard J, Bertini R, Bettinelli M, Birsa R, Bisplinghoff J, Bordalo P, Bradamante F, Bravar A, Bressan A, Brona G, Burtin E, Bussa MP, Chapiro A, Chiosso M, Chung SU, Cicuttin A, Colantoni M, Crespo ML, Dalla Torre S, Dafni T, Das S, Dasgupta SS, Denisov OY, Dhara L, Diaz V, Dinkelbach AM, Donskov SV, Doshita N, Duic V, Dünnweber W, Efremov A, El Alaoui A, Eversheim PD, Eyrich W, Faessler M, Ferrero A, Finger M, Finger M, Fischer H, Franco C, Friedrich JM, Garfagnini R, Gautheron F, Gavrichtchouk OP, Gazda R, Gerassimov S, Geyer R, Giorgi M, Gobbo B, Goertz S, Grabmüller S, Grajek OA, Grasso A, Grube B, Gushterski R, Guskov A, Haas F, von Harrach D, Hasegawa T, Heckmann J, Heinsius FH, Hermann R, Herrmann F, Hess C, Hinterberger F, Horikawa N, Höppner C, d'Hose N, Ilgner C, Ishimoto S, Ivanov O, Ivanshin Y, Iwata T, Jahn R, Jasinski P, Jegou G, Joosten R, Kabuss E, Kang D, Ketzer B, Khaustov GV, Khokhlov YA, Kisselev Y, Klein F, Klimaszewski K, Koblitz S, Koivuniemi JH, Kolosov VN, Komissarov EV, Kondo K, Königsmann K, Konopka R, Konorov I, Konstantinov VF, Korzenev A, Kotzinian AM, Kouznetsov O, Kowalik K, Krämer M, Kral A, Kroumchtein ZV, Kuhn R, Kunne F, Kurek K, Lauser L, Le Goff JM, Lednev AA, Lehmann A, Levorato S, Lichtenstadt J, Liska T, Maggiora A, Maggiora M, Magnon A, Mallot GK, Mann A, Marchand C, Marroncle J, Martin A, Marzec J, Massmann F, Matsuda T, Maximov AN, Meyer W, Michigami T, Mikhailov YV, Moinester MA, Mutter A, Nagaytsev A, Nagel T, Nassalski J, Negrini T, Nerling F, Neubert S, Neyret D, Nikolaenko VI, Olshevsky AG, Ostrick M, Padee A, Panknin R, Panzieri D, Parsamyan B, Paul S, Pawlukiewicz-Kaminska B, Perevalova E, Pesaro G, Peshekhonov DV, Piragino G, Platchkov S, Pochodzalla J, Polak J, Polyakov VA, Pontecorvo G, Pretz J, Quintans C, Rajotte JF, Ramos S, Rapatsky V, Reicherz G, Reggiani D, Richter A, Robinet F, Rocco E, Rondio E, Ryabchikov DI, Samoylenko VD, Sandacz A, Santos H, Sapozhnikov MG, Sarkar S, Savin IA, Sbrizzai G, Schiavon P, Schill C, Schlüter T, Schmitt L, Schopferer S, Schröder W, Shevchenko OY, Siebert HW, Silva L, Sinha L, Sissakian AN, Slunecka M, Smirnov GI, Sosio S, Sozzi F, Srnka A, Stolarski M, Sulc M, Sulej R, Takekawa S, Tessaro S, Tessarotto F, Teufel A, Tkatchev LG, Uhl S, Uman I, Venugopal G, Virius M, Vlassov NV, Vossen A, Weitzel Q, Windmolders R, Wiślicki W, Wollny H, Zaremba K, Zavertyaev M, Zemlyanichkina E, Ziembicki M, Zhao J, Zhuravlev N, Zvyagin A. Observation of a J(PC)=1-+ exotic resonance in diffractive dissociation of 190 GeV/c π- into π- π- π+. PHYSICAL REVIEW LETTERS 2010; 104:241803. [PMID: 20867295 DOI: 10.1103/physrevlett.104.241803] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2009] [Indexed: 05/29/2023]
Abstract
The COMPASS experiment at the CERN SPS has studied the diffractive dissociation of negative pions into the π- π- π+ final state using a 190 GeV/c pion beam hitting a lead target. A partial wave analysis has been performed on a sample of 420,000 events taken at values of the squared 4-momentum transfer t' between 0.1 and 1 GeV2/c2. The well-known resonances a1(1260), a2(1320), and π2(1670) are clearly observed. In addition, the data show a significant natural-parity exchange production of a resonance with spin-exotic quantum numbers J(PC)=1-+ at 1.66 GeV/c2 decaying to ρπ. The resonant nature of this wave is evident from the mass-dependent phase differences to the J(PC)=2-+ and 1++ waves. From a mass-dependent fit a resonance mass of (1660±10(-64)(+0)) MeV/c2 and a width of (269±21(-64)(+42)) MeV/c2 are deduced, with an intensity of (1.7±0.2)% of the total intensity.
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Abela E, Wiest R, Federspiel A, Hess C, Sturzenegger M. Right parietal-prefrontal lateralization during somatosensory discrimination of shape. KLIN NEUROPHYSIOL 2010. [DOI: 10.1055/s-0030-1250891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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81
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Wiegmann B, Hess C, Hilfiker A, Haverich A, Fischer S. Improvement of bloodcompatibility of a poly-4-methyl-1-pentene gas exchange membrane by endothelialization. Thorac Cardiovasc Surg 2010. [DOI: 10.1055/s-0029-1246641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Wiegmann B, Hess C, Hilfiker A, Haverich A, Fischer S. 379: Improved Bloodcompatibility of a Poly-4-Methyl-1-Pentene Gas Exchange Membrane by Endothelialization. J Heart Lung Transplant 2010. [DOI: 10.1016/j.healun.2009.11.393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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83
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Jenkins N, Fasano Y, Berthod C, Maggio-Aprile I, Piriou A, Giannini E, Hoogenboom BW, Hess C, Cren T, Fischer Ø. Imaging the essential role of spin fluctuations in high-T(c) superconductivity. PHYSICAL REVIEW LETTERS 2009; 103:227001. [PMID: 20366120 DOI: 10.1103/physrevlett.103.227001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2008] [Revised: 09/14/2009] [Indexed: 05/29/2023]
Abstract
We have used scanning tunneling spectroscopy to investigate short-length electronic correlations in three-layer Bi2Sr2Ca2Cu3O(10+delta) (Bi-2223). We show that the superconducting gap and the energy Omega(dip), defined as the difference between the dip minimum and the gap, are both modulated in space following the lattice superstructure and are locally anticorrelated. Based on fits of our data to a microscopic strong-coupling model, we show that Omega(dip) is an accurate measure of the collective-mode energy in Bi-2223. We conclude that the collective mode responsible for the dip is a local excitation with a doping dependent energy and is most likely the (pi, pi) spin resonance.
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Zenhaeusern G, Gasser O, Hönger G, Durovic B, Stern M, Hess C. Regulatory allospecific NK cell function is differentially associated with HLA C allotypes. Am J Transplant 2009; 9:2624-30. [PMID: 19843037 DOI: 10.1111/j.1600-6143.2009.02808.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Major histocompatibility complex I (MHC I) molecules 'silence' natural killer (NK) cell activity. Conversely, NK cell activity is triggered through cells lacking expression of autologous MHC I. Unexpectedly we found that a subset of NK cells is activated rather than silenced when interacting with cells expressing normal levels of autologous MHC I. Instead of inducing an inflammatory phenotype, however, activation led to the secretion of the regulatory cytokines TGF-beta and IL-10. Importantly, in vitro models of allogeneic interactions showed that targets co-expressing HLA C1 and C2 epitopes best supported, or even enhanced, this cell-contact-mediated regulatory NK cell function. Together, these data ascribe a novel pattern of reactivity to NK cells, with potential implications both in autologous and allogeneic systems.
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Wiegmann B, Hess C, Haverich A, Fischer S. Entwicklung einer Biohybridlunge. ZEITSCHRIFT FUR HERZ THORAX UND GEFASSCHIRURGIE 2009. [DOI: 10.1007/s00398-009-0739-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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86
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Abela E, Federspiel A, Wiest R, Sturzenegger M, Hess C, Weder B. 17. Right-hemispheric lateralization during explicit somatosensory shape discrimination. Clin Neurophysiol 2009. [DOI: 10.1016/j.clinph.2009.07.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Hess C, Herr C, Beisswenger C, Zakharkina T, Schmid RM, Bals R. Myeloid RelA regulates pulmonary host defense networks. Eur Respir J 2009; 35:343-52. [PMID: 19679599 DOI: 10.1183/09031936.00196408] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The pulmonary innate immune system in the respiratory tract eliminates inhaled pathogens. Several cell types contribute to host defense within a complex network. The aim of this study was to evaluate the role of macrophages during pneumonia and in the regulation of the epithelial response to microorganisms. We performed lung infection models in mice lacking myeloid RelA/p65. To study the mechanistic relationships between individual cell types, we applied co-culture models composed of airway epithelial cells (AECs) and macrophages. Mice lacking myeloid RelA/p65 showed significantly decreased bacterial clearance, cytokine expression and neutrophil influx. In addition, the induction of epithelial keratinocyte chemoattractant expression was blunted in these animals. In vitro, AECs were largely insensitive to ligands of Toll-like receptor (TLR)2 or TLR5. Exposure to secretory products of macrophages results in an increased release of pro-inflammatory cytokines and augmented antimicrobial activity. This was associated with increased expression of TLR genes and surface expression of the proteins. Experiments with blocking antibodies showed that the effect of macrophages depends on secreted mediators, including tumour necrosis factor-alpha. In conclusion, the present data show that myeloid RelA is critical for pulmonary host defense. One important mechanism is that macrophages induce the sensitivity of AEC's to microbial patterns.
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Hess C, Guggenheim M, Schiller A, Altintas MA, Giovanoli P, Calcagni M. [Fibrolipohamartoma of the upper extremity: treatment results in six patients over nine years]. HANDCHIR MIKROCHIR P 2009; 42:239-46. [PMID: 19653149 DOI: 10.1055/s-0029-1225364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
BACKGROUND Fibrolipohamartoma (FLH) is a rare, benign congenital malformation of peripheral nerves, mainly the median nerve, less frequently of the ulnar or other nerves. Early symptom is an initially painless, slowly growing and circumscript swelling. Affections at the wrist level or the foot are occasionally accompanied by macrodactyly. Although FLH is a congenital disorder, because of absent or discreet symptoms, the diagnosis is often made in early adulthood only due to a compression neuropathy. Magnetic resonance image findings are pathognomonic, biopsies are not necessary. In the medical literature, FLH has been described for the past forty years only by means of case reports or small case series. Meanwhile, surgical decompression is considered as therapeutic gold standard, in case of an accompanying macrodactyly in combination with corrective procedures for length, breadth and axis. AIM OF THE STUDY To study long term results after surgical compression of FLH und thus an assessment of this therapeutical concept generally accepted as gold standard in this rare entity. PATIENTS AND METHODS Between 1994 and 2004 we treated 9 patients (8 women, 1 man) with 11 tumors, average age was 38 years (3-62). 2 of the 9 patients had macrodactyly. In 7 patients, the median nerve was affected, in one patient bilaterally, in 5 patients the ulnar nerve, and in one patient both ipsilateral median and ulnar nerves. Of those 9 patients, we were able to follow up 6 clinically and electroneurographically. In addition, the DASH-score was collected. Average follow-up after initial decompression was 9 years (2-23). We performed surgical decompression in 5 patients, one patient was treated conservatively. RESULTS Patients with affections of the median nerve showed tendentially better results after surgical decompression compared to those with FLH of the ulnar nerve, irrespective of the affected anatomical level. Surgical decompression led to a relief of the symptoms in all patients; an improvement of motor function, hypaesthesia and cold sensitivity, however, could not be demonstrated. CONCLUSION FLH must be considered in the differential diagnosis of macrodactyly. We recommend surgical decompression, as it leads to relief of the symptoms. It does, however, not have a beneficial effect on already present motor impairments, sensory deficits and cold sensitivity. We strictly advise against tumor resection.
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Abela E, Federspiel A, Wiest R, Sturzenegger M, Hess C, Weder B. Hemispheric functional asymmetry during explicit somatosensory shape discrimination. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)70962-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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91
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Zenhaeusern G, Hönger G, Gasser O, Steiger J, Schaub S, Hess C. CD56(bright) natural killer cells expand and contract irrespective of CD25 antibody treatment in kidney allograft recipients. Scand J Immunol 2009; 69:465-7. [PMID: 19508378 DOI: 10.1111/j.1365-3083.2009.02236.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Schaub S, Nickerson P, Rush D, Mayr M, Hess C, Golian M, Stefura W, Hayglass K. Urinary CXCL9 and CXCL10 levels correlate with the extent of subclinical tubulitis. Am J Transplant 2009; 9:1347-53. [PMID: 19459809 DOI: 10.1111/j.1600-6143.2009.02645.x] [Citation(s) in RCA: 118] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Subclinical tubulitis has been associated with the later development of interstitial fibrosis and tubular atrophy (IF/TA), leading to diminished allograft survival. The aim of this study was to investigate how concentrations of urinary CXC-receptor 3 (CXCR3) chemokines (i.e. CXCL4/9/10/11) and CCL2 relate to the extent of subclinical tubulitis. Using ELISA, urinary CXCR3 chemokines, CCL2 and tubular injury markers (i.e. urinary NGAL and alpha1-microglobulin [alpha1 m]) were measured in patients with stable estimated GFR >or=40 mL/min exhibiting normal tubular histology (n = 24), subclinical borderline tubulitis (n = 18) or subclinical tubulitis Ia/Ib (n = 22), as well as in patients with clinical tubulitis Ia/Ib (n = 17) or IF/TA (n = 10). CXCL9 and CXCL10 were significantly higher in subclinical tubulitis Ia/Ib than in subclinical borderline tubulitis (p <or= 0.03) and normal tubular histology (p <or= 0.0002). By contrast, NGAL, alpha1-m, CXCL4, CXCL11 and CCL2 were not or only marginally distinctive across these patient groups. All urinary chemokines and tubular injury markers were higher in clinical tubulitis Ia/Ib than in normal tubular histology (p <or= 0.002), but only tubular injury markers were elevated in IF/TA. These results demonstrate a correlation of urinary CXCL9 and CXCL10 levels with the extent of subclinical tubulitis suggesting potential as noninvasive screening biomarkers.
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Koitzsch A, Inosov DS, Evtushinsky DV, Zabolotnyy VB, Kordyuk AA, Kondrat A, Hess C, Knupfer M, Büchner B, Sun GL, Hinkov V, Lin CT, Varykhalov A, Borisenko SV. Temperature and doping-dependent renormalization effects of the low energy electronic structure of Ba1-xKxFe2As2 single crystals. PHYSICAL REVIEW LETTERS 2009; 102:167001. [PMID: 19518744 DOI: 10.1103/physrevlett.102.167001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2008] [Revised: 01/30/2009] [Indexed: 05/27/2023]
Abstract
We investigate the low energy electronic structure of Ba1-xKxFe2As2 (x=0; 0.3, T_{c}=32 K) single crystals by angle-resolved photoemission spectroscopy with a focus on the renormalization of the dispersion. A kink feature is detected at E approximately 25 meV for the doped compound which vanishes at T=200 K but stays virtually constant when T_{c} is crossed. Our experimental findings rule out the magnetic resonance mode as the origin of the kink and render conventional electron-phonon coupling unlikely. They put stringent restrictions on the dominant source of the electronic interaction channel.
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Luetkens H, Klauss HH, Kraken M, Litterst FJ, Dellmann T, Klingeler R, Hess C, Khasanov R, Amato A, Baines C, Kosmala M, Schumann OJ, Braden M, Hamann-Borrero J, Leps N, Kondrat A, Behr G, Werner J, Büchner B. The electronic phase diagram of the LaO(1-x)F(x)FeAs superconductor. NATURE MATERIALS 2009; 8:305-309. [PMID: 19234445 DOI: 10.1038/nmat2397] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2008] [Accepted: 01/20/2009] [Indexed: 05/27/2023]
Abstract
The competition of magnetic order and superconductivity is a key element in the physics of all unconventional superconductors, for example in high-transition-temperature cuprates, heavy fermions and organic superconductors. Here superconductivity is often found close to a quantum critical point where long-range antiferromagnetic order is gradually suppressed as a function of a control parameter, for example charge-carrier doping or pressure. It is believed that dynamic spin fluctuations associated with this quantum critical behaviour are crucial for the mechanism of superconductivity. Recently, high-temperature superconductivity has been discovered in iron pnictides, providing a new class of unconventional superconductors. Similar to other unconventional superconductors, the parent compounds of the pnictides show a magnetic ground state and superconductivity is induced on charge-carrier doping. In this Letter the structural and electronic phase diagram is investigated by means of X-ray scattering, muon spin relaxation and Mössbauer spectroscopy on the series LaO(1-x)F(x)FeAs. We find a discontinuous first-order-like change of the Néel temperature, the superconducting transition temperature and the respective order parameters. Our results strongly question the relevance of quantum critical behaviour in iron pnictides and prove a strong coupling of the structural orthorhombic distortion and the magnetic order both disappearing at the phase boundary to the superconducting state.
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Gasser O, Bihl F, Sanghavi S, Rinaldo C, Rowe D, Hess C, Stablein D, Roland M, Stock P, Brander C. Treatment-dependent loss of polyfunctional CD8+ T-cell responses in HIV-infected kidney transplant recipients is associated with herpesvirus reactivation. Am J Transplant 2009; 9:794-803. [PMID: 19298451 PMCID: PMC2746278 DOI: 10.1111/j.1600-6143.2008.02539.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Antiretroviral-therapy has dramatically changed the course of HIV infection and HIV-infected (HIV(+)) individuals are becoming more frequently eligible for solid-organ transplantation. However, only scarce data are available on how immunosuppressive (IS) strategies relate to transplantation outcome and immune function. We determined the impact of transplantation and immune-depleting treatment on CD4+ T-cell counts, HIV-, EBV-, and Cytomegalovirus (CMV)-viral loads and virus-specific T-cell immunity in a 1-year prospective cohort of 27 HIV(+) kidney transplant recipients. While the results show an increasing breadth and magnitude of the herpesvirus-specific cytotoxic T-cell (CTL) response over-time, they also revealed a significant depletion of polyfunctional virus-specific CTL in individuals receiving thymoglobulin as a lymphocyte-depleting treatment. The disappearance of polyfunctional CTL was accompanied by virologic EBV-reactivation events, directly linking the absence of specific polyfunctional CTL to viral reactivation. The data provide first insights into the immune-reserve in HIV+ infected transplant recipients and highlight new immunological effects of thymoglobulin treatment. Long-term studies will be needed to assess the clinical risk associated with thymoglobulin treatment, in particular with regards to EBV-associated lymphoproliferative diseases.
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Cavalleri M, Hermann K, Knop-Gericke A, Hävecker M, Herbert R, Hess C, Oestereich A, Döbler J, Schlögl R. Analysis of silica-supported vanadia by X-ray absorption spectroscopy: Combined theoretical and experimental studies. J Catal 2009. [DOI: 10.1016/j.jcat.2008.12.013] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Herr C, Beisswenger C, Hess C, Kandler K, Suttorp N, Welte T, Schroeder JM, Vogelmeier C, Group RBFTCS. Suppression of pulmonary innate host defence in smokers. Thorax 2009; 64:144-9. [DOI: 10.1136/thx.2008.102681] [Citation(s) in RCA: 108] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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98
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Berger CT, Wolbers M, Meyer P, Daikeler T, Hess C. High incidence of severe ischaemic complications in patients with giant cell arteritis irrespective of platelet count and size, and platelet inhibition. Rheumatology (Oxford) 2009; 48:258-61. [PMID: 19129348 DOI: 10.1093/rheumatology/ken480] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE Vision loss and ischaemic stroke are feared complications in GCA. We investigated how platelet count and size and platelet inhibition with ASA relate to ischaemic complications in patients with GCA. METHODS Charts of patients with GCA were retrospectively analysed. Jaw claudication, amaurosis fugax, blurred vision, ischaemic stroke and permanent visual loss were classified as 'ischaemic events'; ischaemic stroke and permanent visual loss were sub-grouped as 'severe ischaemic events'. The incidence of ischaemia and the association to the pre-defined covariates age, fever, ESR, platelet count and size and ASA treatment were assessed. RESULTS Eighty-five patients (mean age 73 yrs, 60% women, 78% biopsy-proven) were included in the analysis. Of the 85 patients, 62 (73%) presented with ischaemic events, 29/85 patients (34%) with severe ischaemic events. At the time of diagnosis 22/85 patients (26%) were treated with ASA. Of these 22 patients, 15 (68%) presented with ischaemic events, 7/22 patients (32%) with severe ischaemic events. In multivariate analysis, neither platelet count nor size or ASA treatment were significantly associated with ischaemic or severe ischaemic events. CONCLUSIONS The incidence of severe ischaemic events in patients with GCA was high, irrespective of platelet count and size and established ASA treatment.
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Drechsler SL, Grobosch M, Koepernik K, Behr G, Köhler A, Werner J, Kondrat A, Leps N, Hess C, Klingeler R, Schuster R, Büchner B, Knupfer M. Optical study of LaO0.9F0.1FeAs: evidence for a weakly coupled superconducting state. PHYSICAL REVIEW LETTERS 2008; 101:257004. [PMID: 19113745 DOI: 10.1103/physrevlett.101.257004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2008] [Indexed: 05/27/2023]
Abstract
We have studied the reflectance of the recently discovered superconductor LaO0.9F0.1FeAs in a wide energy range from the far infrared to the visible regime. We report on the observation of infrared active phonons, the plasma edge, and possible interband transitions. On the basis of this data and the reported in-plane penetration depth lambda{L}(0)=254 nm [H. Luetkens, Phys. Rev. Lett. 101, 097009 (2008)] a disorder sensitive relatively small value of the total electron-boson coupling constant lambda{tot}=lambda{e-ph}+lambda{e-sp} approximately 0.6+/-0.35 can be estimated adopting an effective single-band picture.
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Fuchs G, Drechsler SL, Kozlova N, Behr G, Köhler A, Werner J, Nenkov K, Klingeler R, Hamann-Borrero J, Hess C, Kondrat A, Grobosch M, Narduzzo A, Knupfer M, Freudenberger J, Büchner B, Schultz L. High-field pauli-limiting behavior and strongly enhanced upper critical magnetic fields near the transition temperature of an arsenic-deficient LaO0.9F0.1FeAs1-delta superconductor. PHYSICAL REVIEW LETTERS 2008; 101:237003. [PMID: 19113583 DOI: 10.1103/physrevlett.101.237003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2008] [Indexed: 05/15/2023]
Abstract
We report upper critical field Bc2(T) data for disordered (arsenic-deficient) LaO0.9F0.1FeAs1-delta in a wide temperature and magnetic field range up to 47 T. Because of the large linear slope of Bc2 approximately -5.4 to -6.6 T/K near Tc approximately 28.5 K, the T dependence of the in-plane Bc2(T) shows a flattening near 23 K above 30 T which points to Pauli-limited behavior with Bc2(0) approximately 63-68 T. Our results are discussed in terms of disorder effects within [corrected] unconventional superconducting pairings.
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